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0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Allow access to a raw mixing buffer */
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29
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30 #include <stdio.h>
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31
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32 #include "SDL_types.h"
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33 #include "SDL_error.h"
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34 #include "SDL_timer.h"
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35 #include "SDL_audio.h"
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36 #include "SDL_audio_c.h"
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37 #include "SDL_dx5audio.h"
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38
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39 /* Define this if you want to use DirectX 6 DirectSoundNotify interface */
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40 //#define USE_POSITION_NOTIFY
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41
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42 /* DirectX function pointers for audio */
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43 HRESULT (WINAPI *DSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
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44
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45 /* Audio driver functions */
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46 static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec);
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47 static void DX5_ThreadInit(_THIS);
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48 static void DX5_WaitAudio_BusyWait(_THIS);
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49 #ifdef USE_POSITION_NOTIFY
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50 static void DX6_WaitAudio_EventWait(_THIS);
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51 #endif
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52 static void DX5_PlayAudio(_THIS);
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53 static Uint8 *DX5_GetAudioBuf(_THIS);
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54 static void DX5_WaitDone(_THIS);
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55 static void DX5_CloseAudio(_THIS);
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56
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57 /* Audio driver bootstrap functions */
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58
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59 static int Audio_Available(void)
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60 {
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61 HINSTANCE DSoundDLL;
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62 int dsound_ok;
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63
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64 /* Version check DSOUND.DLL (Is DirectX okay?) */
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65 dsound_ok = 0;
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66 DSoundDLL = LoadLibrary("DSOUND.DLL");
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67 if ( DSoundDLL != NULL ) {
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68 /* We just use basic DirectSound, we're okay */
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69 /* Yay! */
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70 /* Unfortunately, the sound drivers on NT have
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71 higher latencies than the audio buffers used
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72 by many SDL applications, so there are gaps
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73 in the audio - it sounds terrible. Punt for now.
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74 */
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75 OSVERSIONINFO ver;
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76 ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
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77 GetVersionEx(&ver);
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78 switch (ver.dwPlatformId) {
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79 case VER_PLATFORM_WIN32_NT:
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80 if ( ver.dwMajorVersion > 4 ) {
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81 /* Win2K */
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82 dsound_ok = 1;
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83 } else {
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84 /* WinNT */
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85 dsound_ok = 0;
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86 }
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87 break;
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88 default:
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89 /* Win95 or Win98 */
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90 dsound_ok = 1;
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91 break;
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92 }
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93 /* Now check for DirectX 5 or better - otherwise
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94 * we will fail later in DX5_OpenAudio without a chance
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95 * to fall back to the DIB driver. */
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96 if (dsound_ok) {
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97 /* DirectSoundCaptureCreate was added in DX5 */
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98 if (!GetProcAddress(DSoundDLL, "DirectSoundCaptureCreate"))
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99 dsound_ok = 0;
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100
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101 }
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102 /* Clean up.. */
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103 FreeLibrary(DSoundDLL);
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104 }
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105 return(dsound_ok);
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106 }
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107
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108 /* Functions for loading the DirectX functions dynamically */
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109 static HINSTANCE DSoundDLL = NULL;
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110
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111 static void DX5_Unload(void)
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112 {
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113 if ( DSoundDLL != NULL ) {
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114 FreeLibrary(DSoundDLL);
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115 DSoundCreate = NULL;
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116 DSoundDLL = NULL;
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117 }
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118 }
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119 static int DX5_Load(void)
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120 {
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121 int status;
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122
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123 DX5_Unload();
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124 DSoundDLL = LoadLibrary("DSOUND.DLL");
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125 if ( DSoundDLL != NULL ) {
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126 DSoundCreate = (void *)GetProcAddress(DSoundDLL,
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127 "DirectSoundCreate");
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128 }
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129 if ( DSoundDLL && DSoundCreate ) {
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130 status = 0;
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131 } else {
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132 DX5_Unload();
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133 status = -1;
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134 }
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135 return status;
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136 }
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137
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138 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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139 {
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140 DX5_Unload();
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141 free(device->hidden);
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142 free(device);
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143 }
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144
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145 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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146 {
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147 SDL_AudioDevice *this;
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148
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149 /* Load DirectX */
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150 if ( DX5_Load() < 0 ) {
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151 return(NULL);
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152 }
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153
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154 /* Initialize all variables that we clean on shutdown */
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155 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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156 if ( this ) {
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157 memset(this, 0, (sizeof *this));
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158 this->hidden = (struct SDL_PrivateAudioData *)
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159 malloc((sizeof *this->hidden));
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160 }
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161 if ( (this == NULL) || (this->hidden == NULL) ) {
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162 SDL_OutOfMemory();
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163 if ( this ) {
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164 free(this);
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165 }
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166 return(0);
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167 }
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168 memset(this->hidden, 0, (sizeof *this->hidden));
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169
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170 /* Set the function pointers */
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171 this->OpenAudio = DX5_OpenAudio;
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172 this->ThreadInit = DX5_ThreadInit;
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173 this->WaitAudio = DX5_WaitAudio_BusyWait;
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174 this->PlayAudio = DX5_PlayAudio;
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175 this->GetAudioBuf = DX5_GetAudioBuf;
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176 this->WaitDone = DX5_WaitDone;
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177 this->CloseAudio = DX5_CloseAudio;
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178
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179 this->free = Audio_DeleteDevice;
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180
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181 return this;
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182 }
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183
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184 AudioBootStrap DSOUND_bootstrap = {
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185 "dsound", "Win95/98/2000 DirectSound",
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186 Audio_Available, Audio_CreateDevice
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187 };
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188
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189 static void SetDSerror(const char *function, int code)
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190 {
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191 static const char *error;
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192 static char errbuf[BUFSIZ];
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193
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194 errbuf[0] = 0;
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195 switch (code) {
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196 case E_NOINTERFACE:
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197 error =
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198 "Unsupported interface\n-- Is DirectX 5.0 or later installed?";
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199 break;
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200 case DSERR_ALLOCATED:
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201 error = "Audio device in use";
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202 break;
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203 case DSERR_BADFORMAT:
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204 error = "Unsupported audio format";
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205 break;
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206 case DSERR_BUFFERLOST:
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207 error = "Mixing buffer was lost";
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208 break;
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209 case DSERR_CONTROLUNAVAIL:
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210 error = "Control requested is not available";
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211 break;
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212 case DSERR_INVALIDCALL:
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213 error = "Invalid call for the current state";
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214 break;
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215 case DSERR_INVALIDPARAM:
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216 error = "Invalid parameter";
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217 break;
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218 case DSERR_NODRIVER:
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219 error = "No audio device found";
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220 break;
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221 case DSERR_OUTOFMEMORY:
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222 error = "Out of memory";
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223 break;
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224 case DSERR_PRIOLEVELNEEDED:
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225 error = "Caller doesn't have priority";
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226 break;
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227 case DSERR_UNSUPPORTED:
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228 error = "Function not supported";
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229 break;
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230 default:
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231 sprintf(errbuf, "%s: Unknown DirectSound error: 0x%x",
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232 function, code);
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233 break;
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234 }
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235 if ( ! errbuf[0] ) {
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236 sprintf(errbuf, "%s: %s", function, error);
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237 }
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238 SDL_SetError("%s", errbuf);
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239 return;
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240 }
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241
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242 /* DirectSound needs to be associated with a window */
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243 static HWND mainwin = NULL;
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244 /* */
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245 void DX5_SoundFocus(HWND hwnd)
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246 {
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247 mainwin = hwnd;
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248 }
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249
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250 static void DX5_ThreadInit(_THIS)
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251 {
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252 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
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253 }
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254
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255 static void DX5_WaitAudio_BusyWait(_THIS)
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256 {
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257 DWORD status;
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258 DWORD cursor, junk;
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259 HRESULT result;
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260
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261 /* Semi-busy wait, since we have no way of getting play notification
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262 on a primary mixing buffer located in hardware (DirectX 5.0)
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263 */
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264 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &cursor, &junk);
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265 if ( result != DS_OK ) {
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266 if ( result == DSERR_BUFFERLOST ) {
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267 IDirectSoundBuffer_Restore(mixbuf);
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268 }
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269 #ifdef DEBUG_SOUND
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270 SetDSerror("DirectSound GetCurrentPosition", result);
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271 #endif
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272 return;
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273 }
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274 cursor /= mixlen;
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275
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276 while ( cursor == playing ) {
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277 /* FIXME: find out how much time is left and sleep that long */
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278 SDL_Delay(10);
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279
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280 /* Try to restore a lost sound buffer */
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281 IDirectSoundBuffer_GetStatus(mixbuf, &status);
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282 if ( (status&DSBSTATUS_BUFFERLOST) ) {
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283 IDirectSoundBuffer_Restore(mixbuf);
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284 IDirectSoundBuffer_GetStatus(mixbuf, &status);
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285 if ( (status&DSBSTATUS_BUFFERLOST) ) {
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286 break;
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287 }
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288 }
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289 if ( ! (status&DSBSTATUS_PLAYING) ) {
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290 result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING);
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291 if ( result == DS_OK ) {
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292 continue;
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293 }
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294 #ifdef DEBUG_SOUND
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295 SetDSerror("DirectSound Play", result);
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296 #endif
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297 return;
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298 }
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299
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300 /* Find out where we are playing */
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301 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf,
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302 &cursor, &junk);
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303 if ( result != DS_OK ) {
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304 SetDSerror("DirectSound GetCurrentPosition", result);
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305 return;
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306 }
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307 cursor /= mixlen;
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308 }
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309 }
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310
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311 #ifdef USE_POSITION_NOTIFY
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312 static void DX6_WaitAudio_EventWait(_THIS)
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313 {
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314 DWORD status;
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315 HRESULT result;
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316
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317 /* Try to restore a lost sound buffer */
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318 IDirectSoundBuffer_GetStatus(mixbuf, &status);
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319 if ( (status&DSBSTATUS_BUFFERLOST) ) {
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320 IDirectSoundBuffer_Restore(mixbuf);
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321 IDirectSoundBuffer_GetStatus(mixbuf, &status);
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322 if ( (status&DSBSTATUS_BUFFERLOST) ) {
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323 return;
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324 }
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325 }
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326 if ( ! (status&DSBSTATUS_PLAYING) ) {
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327 result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING);
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328 if ( result != DS_OK ) {
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329 #ifdef DEBUG_SOUND
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330 SetDSerror("DirectSound Play", result);
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331 #endif
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332 return;
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333 }
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334 }
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335 WaitForSingleObject(audio_event, INFINITE);
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336 }
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337 #endif /* USE_POSITION_NOTIFY */
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338
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339 static void DX5_PlayAudio(_THIS)
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340 {
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341 /* Unlock the buffer, allowing it to play */
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342 if ( locked_buf ) {
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343 IDirectSoundBuffer_Unlock(mixbuf, locked_buf, mixlen, NULL, 0);
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344 }
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345
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346 }
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347
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348 static Uint8 *DX5_GetAudioBuf(_THIS)
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349 {
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350 DWORD cursor, junk;
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351 HRESULT result;
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352 DWORD rawlen;
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353
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354 /* Figure out which blocks to fill next */
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355 locked_buf = NULL;
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356 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &cursor, &junk);
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357 if ( result == DSERR_BUFFERLOST ) {
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358 IDirectSoundBuffer_Restore(mixbuf);
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359 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf,
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360 &cursor, &junk);
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361 }
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362 if ( result != DS_OK ) {
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363 SetDSerror("DirectSound GetCurrentPosition", result);
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364 return(NULL);
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365 }
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366 cursor /= mixlen;
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367 playing = cursor;
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368 cursor = (cursor+1)%NUM_BUFFERS;
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369 cursor *= mixlen;
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370
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371 /* Lock the audio buffer */
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372 result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen,
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373 (LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0);
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374 if ( result == DSERR_BUFFERLOST ) {
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375 IDirectSoundBuffer_Restore(mixbuf);
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376 result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen,
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377 (LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0);
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378 }
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379 if ( result != DS_OK ) {
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380 SetDSerror("DirectSound Lock", result);
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381 return(NULL);
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382 }
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383 return(locked_buf);
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384 }
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385
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386 static void DX5_WaitDone(_THIS)
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387 {
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388 Uint8 *stream;
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389
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390 /* Wait for the playing chunk to finish */
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391 stream = this->GetAudioBuf(this);
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392 if ( stream != NULL ) {
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393 memset(stream, silence, mixlen);
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394 this->PlayAudio(this);
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395 }
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396 this->WaitAudio(this);
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397
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398 /* Stop the looping sound buffer */
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399 IDirectSoundBuffer_Stop(mixbuf);
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400 }
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401
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402 static void DX5_CloseAudio(_THIS)
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403 {
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404 if ( sound != NULL ) {
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405 if ( mixbuf != NULL ) {
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406 /* Clean up the audio buffer */
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407 IDirectSoundBuffer_Release(mixbuf);
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408 mixbuf = NULL;
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409 }
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410 if ( audio_event != NULL ) {
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411 CloseHandle(audio_event);
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412 audio_event = NULL;
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413 }
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414 IDirectSound_Release(sound);
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415 sound = NULL;
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416 }
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417 }
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418
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419 /* This function tries to create a primary audio buffer, and returns the
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420 number of audio chunks available in the created buffer.
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421 */
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422 static int CreatePrimary(LPDIRECTSOUND sndObj, HWND focus,
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423 LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize)
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424 {
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425 HRESULT result;
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426 DSBUFFERDESC format;
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427 DSBCAPS caps;
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428 int numchunks;
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429
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430 /* Try to set primary mixing privileges */
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431 result = IDirectSound_SetCooperativeLevel(sndObj, focus,
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432 DSSCL_WRITEPRIMARY);
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433 if ( result != DS_OK ) {
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434 #ifdef DEBUG_SOUND
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435 SetDSerror("DirectSound SetCooperativeLevel", result);
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436 #endif
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437 return(-1);
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|
438 }
|
|
|
439
|
|
|
440 /* Try to create the primary buffer */
|
|
|
441 memset(&format, 0, sizeof(format));
|
|
|
442 format.dwSize = sizeof(format);
|
|
|
443 format.dwFlags=(DSBCAPS_PRIMARYBUFFER|DSBCAPS_GETCURRENTPOSITION2);
|
|
|
444 #ifdef USE_POSITION_NOTIFY
|
|
|
445 format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY;
|
|
|
446 #endif
|
|
|
447 result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL);
|
|
|
448 if ( result != DS_OK ) {
|
|
|
449 #ifdef DEBUG_SOUND
|
|
|
450 SetDSerror("DirectSound CreateSoundBuffer", result);
|
|
|
451 #endif
|
|
|
452 return(-1);
|
|
|
453 }
|
|
|
454
|
|
|
455 /* Check the size of the fragment buffer */
|
|
|
456 memset(&caps, 0, sizeof(caps));
|
|
|
457 caps.dwSize = sizeof(caps);
|
|
|
458 result = IDirectSoundBuffer_GetCaps(*sndbuf, &caps);
|
|
|
459 if ( result != DS_OK ) {
|
|
|
460 #ifdef DEBUG_SOUND
|
|
|
461 SetDSerror("DirectSound GetCaps", result);
|
|
|
462 #endif
|
|
|
463 IDirectSoundBuffer_Release(*sndbuf);
|
|
|
464 return(-1);
|
|
|
465 }
|
|
|
466 if ( (chunksize > caps.dwBufferBytes) ||
|
|
|
467 ((caps.dwBufferBytes%chunksize) != 0) ) {
|
|
|
468 /* The primary buffer size is not a multiple of 'chunksize'
|
|
|
469 -- this hopefully doesn't happen when 'chunksize' is a
|
|
|
470 power of 2.
|
|
|
471 */
|
|
|
472 IDirectSoundBuffer_Release(*sndbuf);
|
|
|
473 SDL_SetError(
|
|
|
474 "Primary buffer size is: %d, cannot break it into chunks of %d bytes\n",
|
|
|
475 caps.dwBufferBytes, chunksize);
|
|
|
476 return(-1);
|
|
|
477 }
|
|
|
478 numchunks = (caps.dwBufferBytes/chunksize);
|
|
|
479
|
|
|
480 /* Set the primary audio format */
|
|
|
481 result = IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt);
|
|
|
482 if ( result != DS_OK ) {
|
|
|
483 #ifdef DEBUG_SOUND
|
|
|
484 SetDSerror("DirectSound SetFormat", result);
|
|
|
485 #endif
|
|
|
486 IDirectSoundBuffer_Release(*sndbuf);
|
|
|
487 return(-1);
|
|
|
488 }
|
|
|
489 return(numchunks);
|
|
|
490 }
|
|
|
491
|
|
|
492 /* This function tries to create a secondary audio buffer, and returns the
|
|
|
493 number of audio chunks available in the created buffer.
|
|
|
494 */
|
|
|
495 static int CreateSecondary(LPDIRECTSOUND sndObj, HWND focus,
|
|
|
496 LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize)
|
|
|
497 {
|
|
|
498 HRESULT result;
|
|
|
499 DSBUFFERDESC format;
|
|
|
500 const int numchunks = 2;
|
|
|
501
|
|
|
502 /* Try to set primary mixing privileges */
|
|
|
503 if ( focus ) {
|
|
|
504 result = IDirectSound_SetCooperativeLevel(sndObj,
|
|
|
505 focus, DSSCL_PRIORITY);
|
|
|
506 } else {
|
|
|
507 result = IDirectSound_SetCooperativeLevel(sndObj,
|
|
|
508 GetDesktopWindow(), DSSCL_NORMAL);
|
|
|
509 }
|
|
|
510 if ( result != DS_OK ) {
|
|
|
511 #ifdef DEBUG_SOUND
|
|
|
512 SetDSerror("DirectSound SetCooperativeLevel", result);
|
|
|
513 #endif
|
|
|
514 return(-1);
|
|
|
515 }
|
|
|
516
|
|
|
517 /* Try to create the secondary buffer */
|
|
|
518 memset(&format, 0, sizeof(format));
|
|
|
519 format.dwSize = sizeof(format);
|
|
|
520 format.dwFlags = DSBCAPS_GETCURRENTPOSITION2;
|
|
|
521 #ifdef USE_POSITION_NOTIFY
|
|
|
522 format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY;
|
|
|
523 #endif
|
|
|
524 if ( ! focus ) {
|
|
|
525 format.dwFlags |= DSBCAPS_GLOBALFOCUS;
|
|
|
526 }
|
|
|
527 format.dwBufferBytes = numchunks*chunksize;
|
|
|
528 if ( (format.dwBufferBytes < DSBSIZE_MIN) ||
|
|
|
529 (format.dwBufferBytes > DSBSIZE_MAX) ) {
|
|
|
530 SDL_SetError("Sound buffer size must be between %d and %d",
|
|
|
531 DSBSIZE_MIN/numchunks, DSBSIZE_MAX/numchunks);
|
|
|
532 return(-1);
|
|
|
533 }
|
|
|
534 format.dwReserved = 0;
|
|
|
535 format.lpwfxFormat = wavefmt;
|
|
|
536 result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL);
|
|
|
537 if ( result != DS_OK ) {
|
|
|
538 SetDSerror("DirectSound CreateSoundBuffer", result);
|
|
|
539 return(-1);
|
|
|
540 }
|
|
|
541 IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt);
|
|
|
542
|
|
|
543 /* We're ready to go */
|
|
|
544 return(numchunks);
|
|
|
545 }
|
|
|
546
|
|
|
547 /* This function tries to set position notify events on the mixing buffer */
|
|
|
548 #ifdef USE_POSITION_NOTIFY
|
|
|
549 static int CreateAudioEvent(_THIS)
|
|
|
550 {
|
|
|
551 LPDIRECTSOUNDNOTIFY notify;
|
|
|
552 DSBPOSITIONNOTIFY *notify_positions;
|
|
|
553 int i, retval;
|
|
|
554 HRESULT result;
|
|
|
555
|
|
|
556 /* Default to fail on exit */
|
|
|
557 retval = -1;
|
|
|
558 notify = NULL;
|
|
|
559
|
|
|
560 /* Query for the interface */
|
|
|
561 result = IDirectSoundBuffer_QueryInterface(mixbuf,
|
|
|
562 &IID_IDirectSoundNotify, (void *)¬ify);
|
|
|
563 if ( result != DS_OK ) {
|
|
|
564 goto done;
|
|
|
565 }
|
|
|
566
|
|
|
567 /* Allocate the notify structures */
|
|
|
568 notify_positions = (DSBPOSITIONNOTIFY *)malloc(NUM_BUFFERS*
|
|
|
569 sizeof(*notify_positions));
|
|
|
570 if ( notify_positions == NULL ) {
|
|
|
571 goto done;
|
|
|
572 }
|
|
|
573
|
|
|
574 /* Create the notify event */
|
|
|
575 audio_event = CreateEvent(NULL, FALSE, FALSE, NULL);
|
|
|
576 if ( audio_event == NULL ) {
|
|
|
577 goto done;
|
|
|
578 }
|
|
|
579
|
|
|
580 /* Set up the notify structures */
|
|
|
581 for ( i=0; i<NUM_BUFFERS; ++i ) {
|
|
|
582 notify_positions[i].dwOffset = i*mixlen;
|
|
|
583 notify_positions[i].hEventNotify = audio_event;
|
|
|
584 }
|
|
|
585 result = IDirectSoundNotify_SetNotificationPositions(notify,
|
|
|
586 NUM_BUFFERS, notify_positions);
|
|
|
587 if ( result == DS_OK ) {
|
|
|
588 retval = 0;
|
|
|
589 }
|
|
|
590 done:
|
|
|
591 if ( notify != NULL ) {
|
|
|
592 IDirectSoundNotify_Release(notify);
|
|
|
593 }
|
|
|
594 return(retval);
|
|
|
595 }
|
|
|
596 #endif /* USE_POSITION_NOTIFY */
|
|
|
597
|
|
|
598 static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec)
|
|
|
599 {
|
|
|
600 HRESULT result;
|
|
|
601 WAVEFORMATEX waveformat;
|
|
|
602
|
|
|
603 /* Set basic WAVE format parameters */
|
|
|
604 memset(&waveformat, 0, sizeof(waveformat));
|
|
|
605 waveformat.wFormatTag = WAVE_FORMAT_PCM;
|
|
|
606
|
|
|
607 /* Determine the audio parameters from the AudioSpec */
|
|
|
608 switch ( spec->format & 0xFF ) {
|
|
|
609 case 8:
|
|
|
610 /* Unsigned 8 bit audio data */
|
|
|
611 spec->format = AUDIO_U8;
|
|
|
612 silence = 0x80;
|
|
|
613 waveformat.wBitsPerSample = 8;
|
|
|
614 break;
|
|
|
615 case 16:
|
|
|
616 /* Signed 16 bit audio data */
|
|
|
617 spec->format = AUDIO_S16;
|
|
|
618 silence = 0x00;
|
|
|
619 waveformat.wBitsPerSample = 16;
|
|
|
620 break;
|
|
|
621 default:
|
|
|
622 SDL_SetError("Unsupported audio format");
|
|
|
623 return(-1);
|
|
|
624 }
|
|
|
625 waveformat.nChannels = spec->channels;
|
|
|
626 waveformat.nSamplesPerSec = spec->freq;
|
|
|
627 waveformat.nBlockAlign =
|
|
|
628 waveformat.nChannels * (waveformat.wBitsPerSample/8);
|
|
|
629 waveformat.nAvgBytesPerSec =
|
|
|
630 waveformat.nSamplesPerSec * waveformat.nBlockAlign;
|
|
|
631
|
|
|
632 /* Update the fragment size as size in bytes */
|
|
|
633 SDL_CalculateAudioSpec(spec);
|
|
|
634
|
|
|
635 /* Open the audio device */
|
|
|
636 result = DSoundCreate(NULL, &sound, NULL);
|
|
|
637 if ( result != DS_OK ) {
|
|
|
638 SetDSerror("DirectSoundCreate", result);
|
|
|
639 return(-1);
|
|
|
640 }
|
|
|
641
|
|
|
642 /* Create the audio buffer to which we write */
|
|
|
643 NUM_BUFFERS = -1;
|
|
|
644 if ( mainwin ) {
|
|
|
645 NUM_BUFFERS = CreatePrimary(sound, mainwin, &mixbuf,
|
|
|
646 &waveformat, spec->size);
|
|
|
647 }
|
|
|
648 if ( NUM_BUFFERS < 0 ) {
|
|
|
649 NUM_BUFFERS = CreateSecondary(sound, mainwin, &mixbuf,
|
|
|
650 &waveformat, spec->size);
|
|
|
651 if ( NUM_BUFFERS < 0 ) {
|
|
|
652 return(-1);
|
|
|
653 }
|
|
|
654 #ifdef DEBUG_SOUND
|
|
|
655 fprintf(stderr, "Using secondary audio buffer\n");
|
|
|
656 #endif
|
|
|
657 }
|
|
|
658 #ifdef DEBUG_SOUND
|
|
|
659 else
|
|
|
660 fprintf(stderr, "Using primary audio buffer\n");
|
|
|
661 #endif
|
|
|
662
|
|
|
663 /* The buffer will auto-start playing in DX5_WaitAudio() */
|
|
|
664 playing = 0;
|
|
|
665 mixlen = spec->size;
|
|
|
666
|
|
|
667 #ifdef USE_POSITION_NOTIFY
|
|
|
668 /* See if we can use DirectX 6 event notification */
|
|
|
669 if ( CreateAudioEvent(this) == 0 ) {
|
|
|
670 this->WaitAudio = DX6_WaitAudio_EventWait;
|
|
|
671 } else {
|
|
|
672 this->WaitAudio = DX5_WaitAudio_BusyWait;
|
|
|
673 }
|
|
|
674 #endif
|
|
|
675 return(0);
|
|
|
676 }
|
|
|
677
|
